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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.squareup.okhttp.internal;
import java.io.Closeable;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Array;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.URI;
import java.net.URL;
import java.nio.charset.Charset;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import okio.Buffer;
import okio.ByteString;
import okio.Source;
/** Junk drawer of utility methods. */
public final class Util {
public static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
public static final String[] EMPTY_STRING_ARRAY = new String[0];
/** A cheap and type-safe constant for the UTF-8 Charset. */
public static final Charset UTF_8 = Charset.forName("UTF-8");
private Util() {
}
public static int getEffectivePort(URI uri) {
return getEffectivePort(uri.getScheme(), uri.getPort());
}
public static int getEffectivePort(URL url) {
return getEffectivePort(url.getProtocol(), url.getPort());
}
private static int getEffectivePort(String scheme, int specifiedPort) {
return specifiedPort != -1 ? specifiedPort : getDefaultPort(scheme);
}
public static int getDefaultPort(String protocol) {
if ("http".equals(protocol)) return 80;
if ("https".equals(protocol)) return 443;
return -1;
}
public static void checkOffsetAndCount(long arrayLength, long offset, long count) {
if ((offset | count) < 0 || offset > arrayLength || arrayLength - offset < count) {
throw new ArrayIndexOutOfBoundsException();
}
}
/** Returns true if two possibly-null objects are equal. */
public static boolean equal(Object a, Object b) {
return a == b || (a != null && a.equals(b));
}
/**
* Closes {@code closeable}, ignoring any checked exceptions. Does nothing
* if {@code closeable} is null.
*/
public static void closeQuietly(Closeable closeable) {
if (closeable != null) {
try {
closeable.close();
} catch (RuntimeException rethrown) {
throw rethrown;
} catch (Exception ignored) {
}
}
}
/**
* Closes {@code socket}, ignoring any checked exceptions. Does nothing if
* {@code socket} is null.
*/
public static void closeQuietly(Socket socket) {
if (socket != null) {
try {
socket.close();
} catch (RuntimeException rethrown) {
throw rethrown;
} catch (Exception ignored) {
}
}
}
/**
* Closes {@code serverSocket}, ignoring any checked exceptions. Does nothing if
* {@code serverSocket} is null.
*/
public static void closeQuietly(ServerSocket serverSocket) {
if (serverSocket != null) {
try {
serverSocket.close();
} catch (RuntimeException rethrown) {
throw rethrown;
} catch (Exception ignored) {
}
}
}
/**
* Closes {@code a} and {@code b}. If either close fails, this completes
* the other close and rethrows the first encountered exception.
*/
public static void closeAll(Closeable a, Closeable b) throws IOException {
Throwable thrown = null;
try {
a.close();
} catch (Throwable e) {
thrown = e;
}
try {
b.close();
} catch (Throwable e) {
if (thrown == null) thrown = e;
}
if (thrown == null) return;
if (thrown instanceof IOException) throw (IOException) thrown;
if (thrown instanceof RuntimeException) throw (RuntimeException) thrown;
if (thrown instanceof Error) throw (Error) thrown;
throw new AssertionError(thrown);
}
/**
* Attempts to exhaust {@code source}, returning true if successful. This is useful when reading
* a complete source is helpful, such as when doing so completes a cache body or frees a socket
* connection for reuse.
*/
public static boolean discard(Source source, int timeout, TimeUnit timeUnit) {
try {
return skipAll(source, timeout, timeUnit);
} catch (IOException e) {
return false;
}
}
/**
* Reads until {@code in} is exhausted or the deadline has been reached. This is careful to not
* extend the deadline if one exists already.
*/
public static boolean skipAll(Source source, int duration, TimeUnit timeUnit) throws IOException {
long now = System.nanoTime();
long originalDuration = source.timeout().hasDeadline()
? source.timeout().deadlineNanoTime() - now
: Long.MAX_VALUE;
source.timeout().deadlineNanoTime(now + Math.min(originalDuration, timeUnit.toNanos(duration)));
try {
Buffer skipBuffer = new Buffer();
while (source.read(skipBuffer, 2048) != -1) {
skipBuffer.clear();
}
return true; // Success! The source has been exhausted.
} catch (InterruptedIOException e) {
return false; // We ran out of time before exhausting the source.
} finally {
if (originalDuration == Long.MAX_VALUE) {
source.timeout().clearDeadline();
} else {
source.timeout().deadlineNanoTime(now + originalDuration);
}
}
}
/** Returns a 32 character string containing an MD5 hash of {@code s}. */
public static String md5Hex(String s) {
try {
MessageDigest messageDigest = MessageDigest.getInstance("MD5");
byte[] md5bytes = messageDigest.digest(s.getBytes("UTF-8"));
return ByteString.of(md5bytes).hex();
} catch (NoSuchAlgorithmException | UnsupportedEncodingException e) {
throw new AssertionError(e);
}
}
/** Returns a Base 64-encoded string containing a SHA-1 hash of {@code s}. */
public static String shaBase64(String s) {
try {
MessageDigest messageDigest = MessageDigest.getInstance("SHA-1");
byte[] sha1Bytes = messageDigest.digest(s.getBytes("UTF-8"));
return ByteString.of(sha1Bytes).base64();
} catch (NoSuchAlgorithmException | UnsupportedEncodingException e) {
throw new AssertionError(e);
}
}
/** Returns a SHA-1 hash of {@code s}. */
public static ByteString sha1(ByteString s) {
try {
MessageDigest messageDigest = MessageDigest.getInstance("SHA-1");
byte[] sha1Bytes = messageDigest.digest(s.toByteArray());
return ByteString.of(sha1Bytes);
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
}
}
/** Returns an immutable copy of {@code list}. */
public static List immutableList(List list) {
return Collections.unmodifiableList(new ArrayList<>(list));
}
/** Returns an immutable list containing {@code elements}. */
public static List immutableList(T... elements) {
return Collections.unmodifiableList(Arrays.asList(elements.clone()));
}
/** Returns an immutable copy of {@code map}. */
public static Map immutableMap(Map map) {
return Collections.unmodifiableMap(new LinkedHashMap<>(map));
}
public static ThreadFactory threadFactory(final String name, final boolean daemon) {
return new ThreadFactory() {
@Override public Thread newThread(Runnable runnable) {
Thread result = new Thread(runnable, name);
result.setDaemon(daemon);
return result;
}
};
}
/**
* Returns an array containing containing only elements found in {@code first} and also in
* {@code second}. The returned elements are in the same order as in {@code first}.
*/
@SuppressWarnings("unchecked")
public static T[] intersect(Class arrayType, T[] first, T[] second) {
List result = intersect(first, second);
return result.toArray((T[]) Array.newInstance(arrayType, result.size()));
}
/**
* Returns a list containing containing only elements found in {@code first} and also in
* {@code second}. The returned elements are in the same order as in {@code first}.
*/
private static List intersect(T[] first, T[] second) {
List result = new ArrayList<>();
for (T a : first) {
for (T b : second) {
if (a.equals(b)) {
result.add(b);
break;
}
}
}
return result;
}
}
